Barrel-filter.



No. 782.031. PATENTED FEB. '7, 1905. H. G. HOLTHOPF.

BARREL FILTER.

APPLIOATION NLBD JUNE 1, 1903.

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` H. C. HOLTHOPP.

BARREL FILTER.

APPLIOATIQN FILED JUNE 1, 190s.

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No. 782,031. Patented February 7, 1905.

ilNiTED STATES PATENT OEETcE.

HENRY C. HOLTHOFF, OF MHVAUKFE, VSCONSN, ASSIGNOR TO POVER AND MINlNG MAGHlNERY COMPANY, OF GUDAHY, VISOONSIN, A COR- PORATION OF NEV JERSEY.

BARREL-FILTER.

SPECIFICATION forming part of Letters Patent No. 782,031, dated February '7, 1905.

u Application filed June 1,1903. Serial No. 159,452.

To w77 117mm/ it 11ml/ fie/wem.' l a filter ot' this kind is used, the hai-rel is Be it known that I, HENRY (l. HOL'IHOEF, a stopped with the filter at the bottom in ahori- 50 citizen otl the United States, residing' at Mill Zontal position. A pipe or hose leading' from waukee, in the eountyot Milwaukeeand State i a compressed-air or water supply is coupled of' lVisconsin, have invented certain ne f and i with the upper part ot' the barrel, and a disusef'ul Improvements in Barrel-Filters, ot 1 charge-valve in the barrel below the filter is which the following is a specification, ret'eropened. The valve in theinlet connection be- 55 ence beinghad tothe accompanying'drawings, ing then opened, air or water is forced into the Iforming a part thereof. barrel above the charge ot' ore and the liquor io This invention relates particularly to metali or solution is forced through the filter' and dislurgieal barrels for the chemical reduction ot' charged below it. A flat filter o'fl this kind ores. has been f'ound objectionable t'or the following 60 The main objects ot' the invention are to reasons: The filter' being' constructed ot lead provide such a barrel with a filter arranged aud other heavy material and located entirely I centrally or coaxially with relation thereto on one side of' the axis of' the barrel unbalwhereby the balance ot' the barrel is mainl ances the barrel and necessitates the wasteful tained and less power required to rotate it, to use of power to rotate it. VIt is dilficult to 65 provide for withdrawing the liquor through i hold such a filter firmly in place. Being' fasthe filtert'romacharge ot' orewithoutstopping tened to the shell or cylinder ot' the barrel,

2O the barrel, to increase the filtering area in a i the filter is subjected to the abrasion ot' the barrel of` any given capacity, to prevent or ore, which is thrown with its whole weight diminish abrasion and wear otl the filter by upon it with every revolution of' the barrel, 70

the ore, and generally to improve the constructhereby causing it to wear rapidly. To withtion and operation of' this class ot'apparatus. draw the liquor or solution after each charge 1t consists in certain novel features ot' con of' ore has been treated, it is necessary to stop struction and in the peculiar arrangement and il the barrel and connect a detachable water or combinationsot' parts hereinafter particularly air supply pipe therewith, and unless a simi- 75 described, and pointed out in the claims. i lar connection is made for conducting ott' the In the accompanying drawings like letters liquor or solution the fumes given oftl by the designate the same parts in the several figures. l solution are suffocating'.

Figure 1 is a central longitudinal section o'f i To obviate these objections incident to the al.)arrel-iilterembodying' my invention. Fig'. l use of a flat filter and to attain the objects 8O '2 is a cross-section of the same on the line 2 2, l hereinbe'fore stated is the purpose ot the pres- Fig. 1. Fig'. 3 is an enlarged cross-section ot i ent invention.

a part ot' a modified form of the filter-frame Referring' to the accompanying drawings and filter-body. Fig'. et is an outside view, and particularlyv to Figs. 1 and Q, r1 is a rotary and Fig'. 5 is a longitudinal section ot the l barrel, which maybe convenientlyconstructed S5 same; and Fig. 6 is an outside view, on an enof' a shell or cylinder ot sheet iron or steel, larged scale, of' a part of the filter-frame i bolted to cast-iron heads It is provided 40 shown in Figs. 1 and 2. l on one side with a charging-opening having At present flat filters are usually employed a removable cover c, and the heads are vformed in metallurgical barrels for the treatment of' il with hollow truimions f7, which are supported 90 gold and silver ores with ehloi'in or other z in suitable bearings e and are provided at chemical solutions. These filters run lengththeir outer ends with heads or coversf.

wise through the barrels on one side thereof', For convenience of' illustration on a sufli covering' about one-third of the internal area ciently large scale the barrel is shown in Fig. of' their cylindrical shells. To withdraw the 1 considerably shorter than it is usually made 95 liquor or solution from a charge of' ore when in practice.

The barrel and such parts of the apparatus as are made of corrodible metal are protected by lead.

Surrounding the axis of the drum and ex- 1 tending lengthwise through the same from l end to end a sectional filter-frame is supported on lead-covered longitudinal rods g, which r are secured at their ends in the heads of the drum and are supported at intermediate points between the heads in the proper relation to each other by spreaders L, made of porcelain or other suitable material not affected by acids.

The filter-frame, which'is of cylindrical or j approximately cylindrical form, is constructed of porcelain, lead or other material not affected by acids and is composedv of inner and outer shells z' and j, having in the outer side of the inner shell and in the inner side of the outer shell cavities which coincide with each other and form cells Zr, the opposite outer and inner walls of which are perforated with small holes Z. The component shells of the filter-frame are made in segmental sections united with each other at their edges by rabbet or lapped joints, the sections being of such size that they can be readily passed through the charging-opening in the barrel and assembled therein. .The sections of the frame are bound together and held in place upon the rods g by steel or iron rings m, incased in lead. These rings may be made of any suitable shape, fiat or round in crosssection, and they are preferably placed over the heads of adjoining sections and cover the circumferential joints between them.

The cavities or cells in the filter-frame may be made of different shapesM'for example, approximately square or rectangular, as shown in Figs. l and 2, or conical or tapering, as shown in Figs. 3 and -and the perforations through theiropposing outer and inner walls may be variously arranged.

With the form of filter-frame shown in Figs. l and 2 the cavities or cells are preferably filled with coarse sand, crushed silicious stone, or other suitable granular material not affected by acids, which serves as the filtering body or medium.

With the form of filter-frame shown in Figs. 3, 4, and 5 a filtering body or medium consisting of a finely-perforated sheet n, of lead or other material not affected by acids, may be interposed between the inner and outer shells z and J', as shown in Figs. 3 and 5, but the filter-frame may be constructed in various ways of various materials and any suitable material may be employed therewith as the filtering body or medium within the intended scope of my invention. In the form last mentioned the tapering cavities L" terminate on the outer and inner sides of the filter-frame in single perforations Z.

0 is a lead pipe passing centrally through one of the trunnions of barrel a and bent laterally at its inner end, which passes through 1 one side of the filter-frame and communicates with the interior of the barrel.

p is a lead pipe secured centrally in the head or cover of the other trunnion, through which it communicates with the interior of the filter.

q and 1" are stationary pipes at opposite ends of the barrel leading from a water or compressed-air supply. They are provided with valves s and t and are connected with the outer ends of the rotary pipes o andp through couplings and stuffing-boxes u and o. Pipes @n and rv, provided with valves y and z, are also connected by the couplings and stuffingboxes u and o with the pipes 0 and p.

My improved barrel-filter operates as follows: A charge of ore being placed therein, with the materials for producing the solution to dissolve the metal in the ore, and the cover c and the valves s, t, y, and a' being closed, the barrel is rotated by any suitable driving connection (not shown) until the charge has been subjected sufiiciently to the action of the solution. The solution is then drawn off and filtered without necessarily stopping the barrel by opening the valvess and a. Water or air under pressure being thus admitted through the pipe o into the barrel outside of the filter forces the liquid contained therein through the filter and discharges it at one end thereof through vthe pipes p and The solution, more or less diluted, may be completely removed from the barrel either when it is at rest or in motion by the introduction of water or it may be nearly if not completely discharged from the barrel while rotating by the introduction of compressed air. ln case the filter becomes clogged and it is necessary or desirable to clean it the valves t and y are opened, the valves s and a being closed, and the fiow of liquid through the filter is reversed.

It will be observed that in the operation of the filter hereinbefore described the filter by reason of its form and central location in the barrel is not subjected to the weight and but slightly to the abrading action of the tumbling charge of ore, thereby avoiding rapid wear and deterioration of the filter elements, and that the filter so arranged does not destroy the balance of the barrel and necessitate the employment of excessive power to run it.

lVhen the liquor or solution is drawn off after a charge of ore has been treated therewith, it is unnecessary to stop the barrel or interrupt its operation or to temporarily connect a water or compressed-air supply pipe therewith. By simply opening two valves the liquid contained in the barrel is forced therefrom through the filter, which has an `extended effective area, making it possible to discharge the barrel quickly and being discharged from the barrel through permanent fluid-tight pipe connections suffocating fumes of chlorin or other noxious gases, vapors, or odors are not allowed to escape.

IOO

Various changes other than those hereinbef'ore specifically mentioned in the details of construction and arrangement of parts of the apparatus may be made within the principle and intended scope of my invention.

I claimu l. In a barrel-filter the combination of a rotary barrel having' a hollow trunnion and a valve-controlled pipe connection with said trunnion, and an approximately cylindrical filter, composed of' a perforated cellular filterframe and an interposed filtering body ormedium arranged axially within said barrel and communicatinginside with said trunnion, substantially as described.

2. In a barrel-filter, an approximately cylindrical cellular filter-frame composed of' detachable and separately-removable sections, substantially as described.

3. In a barrel-filter the combination with a rotary barrel provided with a charging-opening and removable cover, of an approximately cylindrical filter-frame composed of' segmental sections or' a size that can be inserted and removed through said opening,sub stantially as described.

1I. In a barrel-filter the combination ofl a rotary barrel having' hollow trunnions anda charging-opening provided with a removable cover, of an approximately cylindrical filterf'rame arranged axially within said barrel and consisting or' inner and outer concentric cellular shells which are composed of' sections of' a size that will pass through said chargingopening, substantially as described.

5. In a barrel-filter the combination of a rotary barrel provided with longitudinal rods and an approximately cylindrical filter composed of' sections which are supported by said rods within said barrel around its axis, substantially as described.

6. In a barrel-filter the combination witha rotary barrel provided with longitudinal rods secured at the ends in the heads of' the barrel, spreaders supporting the rods between the heads, and a filter supported by said rods around the axis o'fl the barrel, substantially as described.

7. In a barrel-filter the combination of a rotary barrel provided with longitudinal rods, a filter composed ot' segmental sections supported by said rods around the axis of said barrel, and rings surrounding said filter and holding its sections in place on said rods, substantially as described.

8. In a barrel-filter the combination witha rotary barrel of an approximately cylindrical perforated cellular filter-frame made in separately-removable sections of' non-corrosive material and arranged axially within said barrel, substantially as described.

9. In a barrel-filter the combination with a rotary barrel,of' an approximately cylindrical filter-frame composed of' inner and outer shells having coinciding' cavities or cells in the inside ofl the outer shell and in the outside of the inner shell, and perfor-ations through the outer and inner walls of said cavities or cells, substantially as described.

l0. In a barrel-filter the combination with a rotary barrel, of' an approximately cylindrical filter-frame composed of' inner and outer shells having coinciding cavities or cells and perf'orations in the inner and outer walls of' said cavities or cells, and a filter-body interposed between said shells,substantially as described.

Il. In a barrel-filter the combination with a rotary barrel, ofl a filter-frame composed ofinner and outer shells having coinciding cavities and perforations in thc inner and outer walls of said cavities, said cavities being` supplied with non-corrosive granular filtering material, substantially as described.

l2. In a barrel-filter the combination with a rotary barrel of an approximately cylindrical filter-frame arranged axially within said barrel and composed of sectional inner and outer shells having` coinciding' cells and perforations in the inner and outer walls of said cells, and a suitable filter-body interposed between said shells, substantially as described.

13. In a barrel-filter the combination with a rotary barrel of an approximately cylindrical filter-frame arranged axially within said barrel and composed of sections forming when assembled, lap ping joints, substantially as described.

In witness whereot' I hereto afHx my signature in presence of two witnesses.

HENRY C. HOLTHOFF.

Vitnesses:

CHAs. L. Goss, ALICE E. Goss. 

